Merge pull request #273 from pantheon-systems/ag/add-support-for-link…

…ing-local-packages

Force link local packages

.npmrc

@@ -1,3 +1,4 @@
 shamefully-hoist=true
 save-workspace-protocol=false
-prefer-workspace-packages=true
+prefer-workspace-packages=true
+link-workspace-packages=true

.pnpmfile.cjs

@@ -0,0 +1,68 @@
+const fs = require("fs");
+const path = require("path");
+
+/**
+ * This pnpm install hook links all packages in the monorepo to their local versions.
+ * This allows us to use published version numbers in package.json files, while still
+ * depending on the local version of the package when inside the monorepo.
+ */
+const monorepoRoot = findMonorepoRoot(process.cwd());
+const workspacePackageDirectories = [
+  "packages",
+  "starters",
+  "configs",
+  "local_testing",
+];
+const workspacePackages = new Map();
+
+workspacePackageDirectories.forEach((workspacePackageDir) => {
+  const allDirs = fs.readdirSync(path.join(monorepoRoot, workspacePackageDir));
+  allDirs
+    .filter((dir) => {
+      return fs
+        .statSync(path.join(monorepoRoot, workspacePackageDir, dir))
+        .isDirectory();
+    })
+    .forEach((dir) => {
+      const pkgPath = path.join(monorepoRoot, workspacePackageDir, dir);
+      const pkgName = require(path.join(pkgPath, "package.json")).name;
+      workspacePackages.set(pkgName, pkgPath);
+    });
+});
+
+module.exports = {
+  hooks: {
+    // This runs after package.json is parsed but before versions are resolved
+    // We just set the dependencies to the local version if they are in the monorepo
+    // These changes to the package.json are not saved to disk, but the resolved versions
+    // are, which is fine for us because users cloning the starterkits will not use the
+    // monorepo's lockfile
+    readPackage(pkg) {
+      for (const dep in pkg.dependencies) {
+        if (workspacePackages.has(dep)) {
+          console.log(`INFO: Linking ${pkg.name} to local version of ${dep}`);
+          pkg.dependencies[dep] = `workspace:*`;
+        }
+      }
+      for (const dep in pkg.devDependencies) {
+        if (workspacePackages.has(dep)) {
+          console.log(`INFO: Linking ${pkg.name} to local version of ${dep}`);
+          pkg.devDependencies[dep] = `workspace:*`;
+        }
+      }
+
+      return pkg;
+    },
+  },
+};
+
+function findMonorepoRoot(currentDir) {
+  let dir = currentDir;
+  while (dir !== path.parse(dir).root) {
+    if (fs.existsSync(path.join(dir, "pnpm-workspace.yaml"))) {
+      return dir;
+    }
+    dir = path.dirname(dir);
+  }
+  return null;
+}